The GOP Bracket Challenge

There are at least four distinct types of Republican presidential candidates battling for 2016 supremacy.

NEW BRUSNWICK, NJ - SEPTEMBER 10: former Republican presidential contender Mitt Romney speaks of Gov. Chris Christie (R-NJ) as they address an audience during a birthday celebration on September 10, 2014 at The Hilton in East Brunswick, NJ. The event, dubbed 'Governor Chris Christie 52nd Birthday Celebration,' also served as a NJ-GOP fundraiser. (Photo by Matt Rainey/Getty Images)
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